Nut-lock.



4 A. E. MYERS.

N UT LOCK'. APPLiCATIQ N FILED JUNE 1,6, 1914.

1,139,897. Patented May 18, 1915.

- INVENTOR- Mmessas:

ATTORNEY.

' vide a simple and efiicient device whereby retraction of nuts on their bolts is pre-' tion, in which ALBERT ELLSWORTI-I MYERS, OF WEST ALEXANDER, PENNSYLVANIA NUT-Look.

Specification of Letters Patent. PatentedMay 18, 1915- lipplication filed June 16, 1914. Serial No. 845,383.

To all whom, it may concern Be it known that I, ALBERT 'E. MYERS, a citizen of the United States of America, and resident of West Alexander, county of Washington, and State of Pennsylvania, have invented certain new and useful Improvements in Nut-Locks, of which the following is a specification.

This invention relates to improvements in nut locks, and it has for its object'to provented. I

In describing the invention in detail, reference is'herein had to the accompanying drawing, forming a part of this specifica- Figure 1 is a perspective view of the-invention applied; Fig. 2 is an inner face view of the nut, with the bolt shown in cross section and in forward rotating position; Fig. 3 is a similar View showing the nutin a position wherein it is locked against rearward rotationgFig. 4 is a partial section on the line 44:, Fig. 3; and Fig. 5 is a perspec- ,tive View of the locking key.

Referring to said drawings, in which like designating characters distinguish like parts throughout the several views1 indicates a boltin the threaded end of which is provided a substantially triangular thread-intersecting recess 2 the rear wall or shoulder V 2 of which forms a right angle, or an angle to the curvature of the bolt. The cavity 4 less than a right angle, with the threads, as isclearly shown in Figs. 2 and 3, and the bottom of which is gradually and regularly inclined or curved forwardand outward to tures wherein the arcs are struck from dif-' ferent centers. The concave curvature of said inner face corresponds substantially to the curvature of the bore and, consequently,

Copies of this patent may be obtained for is of a size and form which readily accom-- modates therein the said key 5, so that forward rotationeof the nut over the threads of the bolt is not hindered, said key being carried thin edge foremost, by the nut and freely riding over said threads, as shown'in Fig. 2. The greatest depth of the recess 2 in the bolt is less than the thicknessof the rear edge of the key, and as a consequence it is not possible for said key to so seat in said recess 2 as to permit the nut toaride thereover. narily disposed in a position wherein the said recess 2 occupies a topmost position," retraction ofthelnutmay only be accomplished to they point where the key will gravitate into said recess, as shown in Fig.

3. In this position, the rear, or thicker, edge of the key seats against the shoulder fl The bolt having been prelimi ATN Free while the front edge thereof remains eleif vated so that it is engaged by the forward wall of the cavity 4 in'thej nut, as shown in Fig. 3. V

What is claimed is The combination with a threaded bolt having a thread-intersecting recess formed therein, one wall of said recess being subf stantially radial and the other wall being gradually inclined forward th r f o to they! outer edges of the threads of a nut having a substantially rectangular cavity formedin its inner face and in open communication throughout its length with its bore, said cavity being ofgreater depth at its rear edge than at its front edge,"and afsubstan-fl I tially rectangular gravityactuated :key

loosely mounted in said cavity, said key ha'v-Lj' "ing a greater thickness at its rear edge than V I at its front edge and also a greater thickness than the depth of the recess in the bolt, 1

said key having its inner face arcuately curved and in contact throughout its length withthe' bolt, said key being adapted when said recess in the nut is moved into a position registering withthe recess in the bolt to have its rear edge drop'into the latter while its front edge remains a substantially unchanged position. v

In testimony whereof, I affix my signature in presence of two subscribing'witnesses.

ALBERT ELLSWORTH MYERS. Witnesses: V 1

A. W. RADER, WM. F. MYERS.

five cents each by addressing the Commissioner of Patents. Washington, D. G. i 

